Method of operating crozing knives



NITD STATES PATENT OFFICE.

GEORGE FINN, OF OSIVEGO, NE\V YORK.

METHOD OF OPERATING CROZING- KNIVES.

Speccation of Letters Patent No To all 'whom it may concern:

Be it known that I, GEORGE FINN, of Oswego, in the county of Oswego and State of New York, have invented certain new and useful Improvements in Machines for Crozing and Ohamfering Barrels; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, in which- Figure l, represents a perspective View of said machine. Fig. 2, represents a vertical section through the tool stock and the mechanism by which it is operated. Fig. 3, rep resents a detached side view of the adjustable wheel which supports the barrel during the operation. Fig. LI, represents the cam wheel which feeds the tool to and from its work. Fig. 5, represents a cross section through the tool stock.

The object of my invention is to simplify the mechanism by which the tool is fed to its work, the arrangements employed having been very complicated, as the feed motion of the cutting tool is to be a variable one and at certain moments so very minute as to require a very nice arrangement to work successfully. The arrangement I use is of a very simple description, and can be made to answer all the requirements which may be demanded as to the motion of the chamfering tool, and works with a positive motion, which is more reliable than a spring and less liable to be clogged by chips or shavings.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

A, represents the frame of the machine.

B, represents a horizontal shaft to which motion is imparted by means of the pulleys O, and which motion is transferred by means of the bevel wheels D, E, to the vertical shaft F. rlhe shaft F, has its bearings in the brace G, of the frame A, in the manner represented in section in Fig. 2, the brace Gr, is formed at its lower side with teeth like those of a bevel wheel, into which the bevel wheel I-I, meshes when the machine is in operation.

K, represents a. block which is keyed to the shaft F, by means of a key or pin b, and which turns with the same, it supports the two bevel wheels I-I, and L, which are keyed to the horizontal shaft N.

O, represents a horizontal bevel wheel,

. 25,498, dated September 20, 1859'.

which runs on the fixed shaft R, and which meshes into the pinion L; the lower side of this bevel wheel is formed with a cam c, the shape of which is represented in Fig. 4.

P, represents the stock of chamfering tool, which can be moved longitudinally on the horizontal part of the block K, and which is guided in its rectilinear motion by the flanges d, Fig. 5. The tongue g, of t-he stock I), runs in a corresponding groove of the block K, and is formed with a groove into which the cam c, runs.

S represents a horizontal wheel which rests upon the forked lever T, the latter having its fulcrum at 7i, the lever T, can be operated by means of the treadle U, on shaft V, which in their turn actuate the pawl 76, thus the wheel S, which is to support the barrel to be chamfered can be raised and lowered, and it is guided in this movement by the guides my, which retain it in its horizontal position.

The operation of the machine is as follows The barrel being placed upon the wheel S it is raised to the required height for the operation of chamfering, its upper end resting against the inner circumference of the ring Q; motion being given to the pulley C, the wheels D, E, and the shaft. F, are operated; this movement causes the block K, to turn with the shaft F, and causes the bevel wheel H, to mesh into the teeth a, on the lower side of the brace G, whereby said bevel wheel is set in motion, imparting a rotary motion to the shaft N, to the bevel wheel L, and to the bevel wheel O; the cam c, now comes in operation and by its eccentricity, imparts a reciprocating motion to the tool stock P, and consequent-ly to the chamfering tool n. It is obvious that the shape of the cam c, can be made such as to give the tool any desired rectilinear motion whether variable or ot-herwise but as it is essential that the tool should be fed to its work very slowly, but be withdrawn from its work quickly so as to lose no time between the operations, by a variable motion of the cutting tool I mean such as will work to the best advantage. By the use of a cam as described herein the tool cannot cut beyond a certain limit as when worked to a certain extent, it will be automatically withdrawn. To give an illustration in numbers as to how this cam works, it may be assumed that during one operation of chamfering, the shaft F, and consequently the cutting tool shall malte ten revolutions, thenl the diameters of the wheels L, and O, must be respectively as one to ten as the Wheel O, must not make more than one revolution during one chamfering operation; now the cam c, can be so constructed that nine tenths of its circumference shall feed the tool to its Work While one tenth or one revolution of the shaft F,

shall withdraw it therefrom, and so this cam may be shaped to any desired requirements, Without the use ot' other mechanical de vices. Besides this, the cam Works the cutter up and back by a positive motion, which is much more certain in its action than Where a spring is used to draw back the cutter, as a chip, shaving, or any small sliver of Wood may clog the spring, and prevent its action, but so long as the cam turns, nothing can prevent the. cutter from being Withdrawn. Its operation is therefore more certain, While the mechanism consisting mainly of occupy more space on the arm that carries them, than that occupied by said bevel Wheel,

for the purpose of simplifying the mechanism, an eeonomizing space on said arm Which 1s necessarily limited 1n length, as herein represented and shown.

GEORGE FINN.

Witnesses:

I. B. FAYETTE, JOHN MCAMBLY. 

